CD Markers

Topic Completed: 1 June 2014

Minor changes: 2 October 2020

Copyright: 2003-2021,, Inc.

PubMed Search: cd26[title]

Nat Pernick, M.D.
Page views in 2020: 626
Page views in 2021 to date: 34
Cite this page: Pernick N. CD26. website. Accessed January 15th, 2021.
Definition / general
  • Widely expressive dipeptidase with various clinical features (see below)
  • Also called dipeptidyl-peptidase IV, DPP4, DDPIV, adenosine deaminase complexing protein 2 (OMIM #102720)
  • Costimulatory molecule in T cell activation and proliferation
  • Also regulates various chemokines and cytokines
  • Cleaves amino-terminal dipeptides
  • Key role in cell adhesion and invasion (BMC Cancer 2013;13:517), plays a role in cell spreading and migration
  • Either soluble in plasma or present on cell surface
Clinical features
Uses by pathologists
  • No significant uses at this time
Microscopic (histologic) images

Images hosted on other servers:
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Colon: normal

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Kidney: proximal tubules

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Prostate: carcinoma

Positive staining - normal
  • Activated T and B cells, basophils, macrophages, NK cells, thymocytes (mature)
  • Epithelium: endometrium, hepatocytes, lung, prostate, renal proximal tubular cells, small intestine
  • Also cytotrophoblast and extravillous trophoblast (J Clin Endocrinol Metab 2002;87:4287), biliary canaliculae, endothelial cells, fibroblasts, mesothelial cells (Oncology 2002;63:158), splenic sinus lining cells
Positive staining - disease
Negative staining
  • Normal thyroid gland, T cells in peripheral blood of mycosis fungoides / cutaneous T cell lymphoma (40%, BMC Clin Pathol 2002;2:5)
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